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Changing the lock barrel on your uPVC door is a straightforward job that can be done within five minutes. You may need to replace the lock barrel for a variety of reasons. The key could be lost or the houseshare is over and the locks are no longer required or they simply don't work as they should. Fixing a Loose Knob A door handle that is loose is not only annoying but it can also pose a security risk. It is usually a simple fix to tighten the screws but it may be more challenging if the mechanism is fault